its a "M" , a "M" is like a "D" without the bayo but still if it was in very good condition then i hope you had one of you american family buy it cos i know SKS-M prices in the US and that is very low . they usually sells for $400 and up.
matter of fact , their standard chinese SKS in very good-excellent condition sells for approx $225-$250 , market prices has come down since the recession of 2008, the ones like unissued like marstar SKS would fetch $300 .
best place to judge the average national prices for a "D" is to go to gunbroker.com, check past 90 completed auctions . there you will find the average prices for a "D" is $500 .
heres a "D" on gunbroker.com , 20 bids last at $555 , two more days to go .
its in excellent condition but nothing outstanding.
i sold two "D" this year , both for $475 each .
gunbroker.com/Auction/ViewItem.aspx?Item=260074471 (type www in front).